Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Category
Synthetic Material (Not A Rock Or Mineral)
Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Synthetic Material (Not A Rock Or Mineral) in the encyclopedia
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Granite Fragment
Felsic Plutonic Rock (Granite)
igneous
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Conglomerate
Conglomerate (Detrital sedimentary rock)
sedimentary
Yellow Jade (Quartzite Jade)
Quartzite (SiO2)
gemstone
Quartzite Pebble
Metamorphic Quartz (SiO2)
metamorphic
Fossil Coral (Petoskey Stone or Chain Coral Pebble)
Hexagonaria percarinata / Rugosa coral (CaCO3)
fossil
Bowling Ball (Brunswick T-Zone Deep Space)
Polyester resin / Polyurethane polymer
Synthetic (not a natural rock)
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Rounded gray pebble, likely basalt or andesite
Fine-grained volcanic rock, probably basaltic-andesite; exact identification requires testing
igneous
Unakite
Unakite (Metamorphosed granite)
metamorphic
Basalt Pebble
Basalt (Mafic volcanic rock)
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Polished orbicular jasper
Orbicular jasper; microcrystalline quartz (SiO₂) with iron oxides and altered volcanic minerals
metamorphic
Pumice
Pumice (a highly vesicular volcanic rock)
igneous
Serpentine
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4)
metamorphic
Dark metamorphic rock, possibly schist
Mica schist (probable; commonly quartz + muscovite/biotite, with possible graphite or chlorite)
metamorphic
Quartzite
Quartzite (SiO2 with minor impurities)
metamorphic
Chert (Commonly called Jasper or Flint)
Chert (SiO2)
sedimentary
Diorite (with Iron Staining)
Phaneritic Intermediate Igneous Rock
igneous
Red Sandstone
Clastic Terrigenous Sedimentary Rock (primarily SiO2 with Fe2O3 coating)
sedimentary
Weathered chert or siliceous limestone
Microcrystalline quartz (SiO₂), possibly with carbonate minerals
sedimentary
Diamond
Diamond (C - Pure Carbon)
gemstone
Banded Sandstone (Liesegang Rings)
Arenite with Liesegang rings (SiO2/Fe2O3)
sedimentary
Diorite
Phaneritic Intermediate Plutonic Rock (Diorite)
igneous
Banded Chert
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Petrified Wood
Silicified Wood
fossil
Quartzite
Quartzite (primarily SiO2)
metamorphic
Ferruginous Conglomerate
Conglomerate with Iron-Oxide Matrix (SiO2 + Fe2O3/FeO(OH))
sedimentary
Serpentinite (serpentinized ultramafic rock)
Serpentine-group minerals, chiefly lizardite and antigorite; commonly derived from peridotite
metamorphic
Basalt (Weathered)
Extrusive Igneous Rock (Mafic composition)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Slag
Glassy silicate byproduct (anthropogenic material)
industrial byproduct
Laterite (Red Clay)
Laterite (Fe2O3 · nH2O and Al2O3 · nH2O)
sedimentary
Black Granite (Basalt or Gabbro)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Chert (Commonly known as Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Greisen (Quartz-Muscovite-Turretine Rock)
Greisen
Metamorphic Rock
Nuummite
Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
metamorphic
Dark mafic rock, likely basalt
Basalt; primarily plagioclase feldspar and pyroxene, commonly with olivine and iron oxides
igneous